What Is Group Health Insurance: Employer Plans, Benefits, and Costs

This article is for informational purposes only and does not constitute financial advice.

What Is Group Health Insurance?

Group health insurance is a health insurance policy purchased by an employer (or other organization such as a union or professional association) that extends coverage to employees and, typically, their eligible dependents. Because the insurer spreads risk across the entire group rather than evaluating each individual\'s health status separately, group plans generally offer lower premiums, broader coverage, and easier qualification than individually purchased policies.

Group health insurance is the primary source of health coverage for working-age Americans. According to the Kaiser Family Foundation\'s Employer Health Benefits Survey, approximately 159 million people in the United States had employer-sponsored health insurance in 2023, representing roughly half the total U.S. population.

How Group Health Insurance Is Structured

The employer enters into a contract with a health insurer (fully-insured plan) or funds the plan directly (self-insured plan) and administers benefits through a third-party administrator (TPA). The employer sets the terms of coverage — which plan types to offer, how much of the premium to contribute, and eligibility rules — within constraints imposed by the Affordable Care Act (ACA) and the Employee Retirement Income Security Act (ERISA).

Plan Types Commonly Offered

• Health Maintenance Organization (HMO): Requires the insured to select a primary care physician (PCP) and obtain referrals to see specialists. Care outside the network is not covered except in emergencies. Lower premiums and out-of-pocket costs in exchange for restricted provider choice.
• Preferred Provider Organization (PPO): Allows in-network and out-of-network care without referrals; in-network care costs less. Greater flexibility at higher premiums.
• High-Deductible Health Plan (HDHP): Lower premiums and higher deductibles; qualifies enrollees to open a Health Savings Account (HSA). Increasingly common as employers shift more cost to employees.
• Exclusive Provider Organization (EPO): Similar to a PPO but covers only in-network providers except for emergencies. No referrals required.
• Point of Service (POS): Hybrid of HMO and PPO; in-network primary care required, but out-of-network care available at higher cost.

ACA Requirements for Employer Plans

Under the ACA, employers with 50 or more full-time-equivalent employees (Applicable Large Employers, or ALEs) are required to offer minimum essential coverage that is both minimum value (pays at least 60% of covered expenses) and affordable (employee-only premium does not exceed 9.02% of household income for 2024) to full-time employees and their dependents. Failure to meet these requirements exposes the employer to employer shared responsibility payments.

Employer and Employee Premium Contributions

The employer\'s premium contribution is a major component of total compensation. On average, employers cover a substantial portion of premiums, particularly for employee-only coverage. According to the 2023 Kaiser Employer Survey:

Employee premium contributions are typically deducted from payroll on a pretax basis through a Section 125 cafeteria plan, reducing the employee\'s taxable income.

Open Enrollment and Special Enrollment Periods

Most employer plans hold an annual open enrollment period — typically in the fall — during which employees can enroll, change plans, add or remove dependents, and adjust benefits. Outside open enrollment, changes are generally restricted to qualifying life events, including:

• Marriage, divorce, or legal separation.
• Birth or adoption of a child.
• Death of a dependent.
• Loss of other qualifying coverage (e.g., spouse loses job).
• A dependent reaching the maximum coverage age (26 for most plans).

COBRA: Continuing Coverage After Separation

The Consolidated Omnibus Budget Reconciliation Act (COBRA) allows employees and their covered dependents to continue group health coverage for a limited period after a qualifying event — such as job loss, reduction in hours, or certain other separation circumstances. Under COBRA, the individual pays the full premium (both employer and employee shares) plus an administrative fee of up to 2%, which typically makes COBRA significantly more expensive than employer-subsidized coverage. COBRA continuation is available for 18 months in most cases (up to 36 months for dependents in certain circumstances).

Fully Insured vs. Self-Insured Plans

• Fully insured: The employer pays premiums to an insurance carrier, which assumes the financial risk. Subject to state insurance regulations.
• Self-insured (self-funded): The employer assumes the financial risk of paying claims directly, often contracting with a TPA for administration and purchasing stop-loss insurance to limit catastrophic claim exposure. Self-insured plans are governed by ERISA, not state insurance law, giving employers more flexibility in plan design. Most large employers self-insure.

Conclusion

Group health insurance remains the cornerstone of U.S. healthcare coverage, providing cost-sharing advantages and risk pooling that make health coverage more accessible and affordable for employees than the individual market. Understanding how plan types, employer contributions, ACA requirements, and COBRA interact helps employees evaluate their benefit options during enrollment periods and plan for healthcare costs throughout their careers.